ManzanilloPolo jumped from tropical storm to 130 mph hurricane.
Guerrero and Michoacán face flooding and landslide risk though the storm may stay offshore.
Record-warm eastern Pacific waters let storms gain strength faster than forecasters can track, the pattern behind Otis devastating Acapulco in 2023.
The National Hurricane Center says Polo may reach Category 5 by Wednesday before turning northwest offshore.
Sources: AP NEWS, Times Colonist, UrduPoint